This compact subwoofer incorporates a number of Yamaha advanced, high-performance bass technologies, such as Twisted Flare Port, Advanced YST II (Yamaha Active Servo Technology II) with discrete amp circuitry and a high-quality 8" woofer unit. The resulting bass response is powerfully rich and impactful. The gentle curves and matte black finish give the subwoofer a stylish and beautiful appearance.